Rear bumper for a vehicle



FIG. 1 is a front view of a rear bumper for a vehicle according to the design;

FIG. 2 is a left perspective view thereof;

FIG. 3 is a right perspective view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a rear view thereof. 

CLAIM The ornamental design for a rear bumper for a vehicle, as shown and described. 